Middlings-purifier



(No Model.)

L. GATHMANN; Middlings Purifier.

Patented. May 10, 1881..

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UNTTED STATES PATENT @rrice.

LOUIS GATHMANN, OF CHICAGO, ILLINOIS.

MIDDLINGS-PURIFIER.

SPECIFICATION forming part of Letters Patent No. 241,133, dated May 10, 1881. Application filed April 5, 1881. (N0 model.)

To all whom it may concern:

Be it known that I, LOUIS GATHMANN, of Chicago, State oflllinois, haveinvented certain new and useful Improvemeutsin Middlings-Purifiers; and I do hereby declare that the followin g is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of this specification.

My invention relates to improvements in middlings-purifiers, having for their several objects the variation of the draft upon the several sections of the screens and the collection of the dust within the purifier and its separate discharge therefrom.

The improvements, which have reference to the variation of the air-currents, and which also refer to the retention of the dust, consist in bodies of cloth of differentthickness or closeness of mesh arrangedover the several sections of the screens, or between the screens and the suction-fan of the purifier, the spaces between the screens and the dust-arresting and draftregulating cloth being divided into chambers by means of vertical partitions, for the purpose of maintaining a separation of the several currents through the screens and their correspondin g regulating-cloths.

In the drawings, Figure 1 is a side elevation of a purifier. Fig. 2 is a central longitudinal vertical section of the same. Fig. 3 is a bot tom view. Figs. 4 and 5 are views of the several dust-arresting and draft-regulatin g cloths detached; and Fig. 6 is an enlarged view, in transverse section, of the traveling fan that works beneath the screens.

A is the purifier frame and case.

B, B, and B are three several sections of a vibrating screen,increasiug in size of mesh in the order given.

D, D, and D are vibrating dust-arresting and draft-regulatin g screens or cloths arran ged to respectively intercept. the air-current from the several screens B, B, and B and also increasing in size of mesh, or otherwise constructed to give increased freedom of passage to the air, .i n the order given.

0, O, and (3 are partitions substantially dividingthe space between thescreens B, B, and B and cloths D, D, and 1) into as many chambers, so that the air passing upward through the several sections of the screen on its way to the fan F will also pass through the corresponding sections of regulating-cloth above them, respectively. The cloths are secured to open frames, two of the|n,-D and D, being in a single frame, F, arranged above and parallel with the inclined screens. The third, D", is set in the frame F nearly vertical, as shown. Each cloth-frame is provided with a knocker, K, operated from the fan-shaft, as indicated, or otherwise. Passages 0 and 0, above the partitions O and U, and 0 at the end of the frame F, afford a slight horizontal current of air as it seeks through them the freer openings of the coarser cloths. The combined action oft-hecurrents, cloths D and D, and knocker K of frame F is therefore as follows: The dust is raised by the current from the sieves, is arrested by the cloths D and D, and is momentarily detached by the knocker. In again being drawn to the cloths by the main current it is drawn along toward the coarser cloth D by the horizontal draft mentioned, and so ultimately reaches the said cloth D Here the gravity of the dust carries it downward at each successive knocking, and it finally falls upon the wings a a, forming chutes, whence it is discharged and disposed of as desired. The settlin g of the dust from the cloth D is facilitated by the said wings a a, which partly cut off or greatly reduce the force of the current through portions of said cloth.

The several bodies D, D, and D of cloth may either be of varied size of mesh, or, say, three thicknesses of a given mesh may be applied to section D, two to section D, and one tosection D The object and effect are, first, to produce currents of different force through the several screen-sections B, B, and B and, second, to arrest the dust taken from the middlings by such currents.

Proceeding next to the screen-cleaning de vice, S is a shaft extendingbeneath the screens, from one end to the other of the machine, having the toothed pinions s s at its extremities, which are fitted to and rest upon the transverse racks r. Opposite the several screen-sections the shaft is provided with rubber or other flexible fans or wings 10, having their free edges straight and preferably smooth. At a central point of the shaft is a link, m, Figs. 2 and 3,

in which the shaft turns, and to which are attached the ends of a cord, 0. Said cord passes over the pulleys p in substantially the same horizontal plane, and at a suitable point between the adjacent pulleys, as shown, has at fixed thereto the button or knob t. Seizing this button with the hand and moving it to and fro between the adjacent pulleys p, the shaft S is obviously impelled from side to side of the machine. Resting by the fixed pinions 8 upon the rack r, it is, of course, rotated as it advances and recedes.

If the shaft S is set to bring the wings 10 very near the screens, a brief sharp blast is induced at all points of the screen successively during the passage of the fan-shaft from side to side of the machine, the violence or gentleness of which will, of course, depend upon the rapidity with which said shaft is made to travel. The effect of the blast from the cleaner-fan is to clear the meshes as effectively as if a brush were used, and the wearing elfect of the brush upon the screen-cloth is wholly avoided.

The racks 1' should preferably be made vertically adjustable, in order that the distance between the fans 70 and thescreens maybe varied at pleasure.

Obviously the traveling fan may be auto matically operated by suitable connection with the main fan or driving shal't.

Having thus described my invention, I claim 1. In combination with a series of purifier-- screens of varying degrees of fineness, a corresponding series of cloths, varying in closeness of texture, arranged with the several screens and the fan to vary the strength of the air-currents through the several screens, substantially as described.

2. The combination, with the screens of a middlin gs-purifier, of the several cloth-sections of varying mesh or density, arranged to vary the force of the air-current through the several screens of the purifier, and also adapted and arranged to intercept the dust from the screens, substantially as described.

'3. In combination with the several varying screen-sections and the several varied cloth sections of the purifier, a partition or partitions arranged between the screens and cloths, whereby the air-current passing through a given screen must find escape mainly through the corresponding cloth, substantially as and for the purposes set forth.

4. In combination with the fan, the sectional screen, and the sectional dust-arresting cloths, varyin gin openness, as described, the partition 0, arranged to direct the air-current from a section of the screen mainly to and through the corresponding section of the cloth, and also arranged to afford the passage 0, whereby the dust detached by the knocker may be gradually drawn from one section to another of the cloth by a minor horizontal draft or current near the cloth, substantially as described.

5. The chutes a a, formed by the cutting away of the tail-board to give passage to the air-current, in combination with the arrester D and i ts knockcr, the arrester being arranged in a vertical, or nearly vertical, position above the tail-board, substantially as described.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

LOUIS GATHMANN.

Vitnesses:

M. E. DAYTON, PETER J. ELLERT. 

